Re: [RFC] Add "rpm_not_supported" flag

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Jul 17, 2014 at 12:40:23AM +0200, Rafael J. Wysocki wrote:
> On Wednesday, July 02, 2014 10:27:06 AM Alan Stern wrote:
> > Here's a brief summary of the story behind this patch...
> > 
> > At one point, I suggested to Dan that instead of doing something
> > special for these devices, we could simply have the runtime_suspend()
> > routine always return -EBUSY.  He didn't like that idea because then
> > the user would see the device was never powering down but would have no
> > idea why.  The rpm_not_supported flag provides this information to the
> > user by causing the power/runtime_status attribute to say "not
> > supported".  (Although to be entirely fair, we could just put a message
> > in the kernel log during probe if the hardware doesn't support runtime
> > suspend.)
> > 
> > Instead, Dan introduced a messy PM QoS mechanism in commit
> > e3d105055525.  I didn't like that approach, but Greg merged it before I
> > objected.
> 
> That really looks a bit like a hack to me to be honest.
> 
> Greg, what's your plan toward this?

If I need to revert something that you all find was wrong, I'll be glad
to do so, sorry for merging something too early.

thanks,

greg k-h